Time Converter
Use this free Time Converter to convert between seconds, milliseconds, microseconds, nanoseconds, minutes, hours, days, weeks, months, years, decades, centuries and millennia. Quickly convert time units for education, science, engineering, programming, business, project planning, work schedules and everyday calculations.
Enter a value, select the unit you want to convert from and choose the unit you want to convert to. The calculator instantly provides the converted time value.
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What Is Time?
Time is a continuous measurement used to describe the sequence and duration of events. Common time units include seconds, minutes, hours, days and weeks. Smaller scientific units include milliseconds, microseconds and nanoseconds, while larger periods include months, years, decades, centuries and millennia.
Time conversion is the process of changing a duration from one time unit into another while preserving the same amount of elapsed time. For example, 2 hours equals 120 minutes and 7,200 seconds.
Time Units Supported
Smart Unit Calc supports a broad range of common, scientific and long-duration time units.
| Time Unit | Symbol | Relationship |
|---|---|---|
| Nanosecond | ns | 1 ns = 0.000000001 second |
| Microsecond | μs | 1 μs = 0.000001 second |
| Millisecond | ms | 1 ms = 0.001 second |
| Second | s | Base unit |
| Minute | min | 60 seconds |
| Hour | h | 3,600 seconds |
| Day | d | 86,400 seconds |
| Week | wk | 604,800 seconds |
| Fortnight | - | 14 days |
| Common Year | yr | 365 days |
| Leap Year | yr | 366 days |
| Decade | decade | 10 years |
| Century | century | 100 years |
| Millennium | millennium | 1,000 years |
Seconds Converter
The second is the standard SI unit of time. Seconds are commonly used in science, engineering, sports, programming and everyday time calculations.
1 hour = 3,600 seconds
1 day = 86,400 seconds
1 week = 604,800 seconds
Milliseconds Converter
A millisecond is one thousandth of a second. Milliseconds are frequently used in computing, networking, electronics, gaming, application performance testing and scientific measurements.
Microseconds Converter
A microsecond is one millionth of a second. Microseconds are useful for measuring very short events in electronics, computing, telecommunications and scientific applications.
Nanoseconds Converter
A nanosecond is one billionth of a second. Nanoseconds are used for extremely short time intervals, particularly in computer processors, high-speed electronics, telecommunications and physics.
Minutes Converter
Minutes are one of the most commonly used units for measuring everyday durations.
1 hour = 60 minutes
1 day = 1,440 minutes
Hours Converter
An hour contains 60 minutes or 3,600 seconds. Hours are commonly used for work schedules, travel durations, project planning, billing, time tracking and everyday activities.
1 hour = 3,600 seconds
1 day = 24 hours
Days Converter
A standard day contains 24 hours. Days are frequently used for calculating delivery schedules, project duration, travel periods, deadlines, leave periods and elapsed time.
1 day = 1,440 minutes
1 day = 86,400 seconds
Weeks Converter
A standard week contains seven days. Weeks are widely used for project schedules, work planning, education, appointments, production schedules and delivery timelines.
1 week = 168 hours
1 week = 10,080 minutes
1 week = 604,800 seconds
Fortnight Converter
A fortnight is a period of 14 days. It is sometimes used in scheduling, payroll periods, historical references and everyday descriptions of two-week periods.
1 fortnight = 336 hours
Months and Time Conversion
A calendar month does not have a single fixed duration. Depending on the month, it contains 28, 29, 30 or 31 days.
Years and Time Conversion
A common calendar year contains 365 days, while a leap year contains 366 days. Because leap years exist, converting years directly to seconds depends on the definition being used.
Leap year = 366 days
1 decade = 10 years
1 century = 100 years
1 millennium = 1,000 years
Decades, Centuries and Millennia
Longer periods of time can be expressed using decades, centuries and millennia. These units are useful for historical, educational and long-term planning purposes.
| Unit | Equivalent |
|---|---|
| 1 Decade | 10 years |
| 1 Century | 100 years |
| 1 Millennium | 1,000 years |
Common Time Conversion Chart
| From | Equivalent |
|---|---|
| 1 second | 1,000 milliseconds |
| 1 minute | 60 seconds |
| 1 hour | 60 minutes |
| 1 hour | 3,600 seconds |
| 1 day | 24 hours |
| 1 day | 1,440 minutes |
| 1 day | 86,400 seconds |
| 1 week | 7 days |
| 1 week | 168 hours |
| 1 fortnight | 14 days |
| 1 decade | 10 years |
| 1 century | 100 years |
| 1 millennium | 1,000 years |
Popular Time Conversions
Seconds to Minutes
To convert seconds to minutes, divide the number of seconds by 60.
Example: 300 seconds ÷ 60 = 5 minutes.
Minutes to Seconds
Example: 10 minutes × 60 = 600 seconds.
Minutes to Hours
Example: 120 minutes ÷ 60 = 2 hours.
Hours to Minutes
Example: 3 hours × 60 = 180 minutes.
Hours to Seconds
Example: 2 hours × 3,600 = 7,200 seconds.
Days to Hours
Example: 5 days × 24 = 120 hours.
Days to Minutes
Example: 2 days × 1,440 = 2,880 minutes.
Days to Seconds
Example: 3 days × 86,400 = 259,200 seconds.
Weeks to Days
Example: 4 weeks × 7 = 28 days.
Weeks to Hours
Time Converter for Work and Business
A time conversion calculator is useful for converting working hours, employee schedules, project durations, service periods, overtime, billing periods and operational timelines.
Businesses can convert minutes into hours, hours into days or seconds into minutes when preparing reports, invoices, productivity measurements and project schedules.
Time Converter for Project Planning
Project managers can use time conversions to estimate project duration, compare task durations and convert schedules between minutes, hours, days and weeks.
For example, a project task requiring 18 hours can be represented as 0.75 standard 24-hour days or 1,080 minutes.
Time Conversion for Science and Engineering
Scientific and engineering calculations often require very small time units. Milliseconds, microseconds and nanoseconds are commonly used when measuring electronic signals, computer processing times, network latency and high-speed systems.
Time Converter for Programming and Computing
Developers frequently work with milliseconds, microseconds and seconds when measuring application response time, API latency, database performance, timers and system processes.
1 second = 1,000,000 μs
1 second = 1,000,000,000 ns
Time Duration and Elapsed Time
Time duration describes how long an activity or event lasts. Elapsed time is the difference between a starting point and an ending point.
For example, if a task starts at 09:00 and ends at 11:30, the elapsed duration is 2 hours and 30 minutes, or 150 minutes.
How to Use the Time Converter
- Enter the time value you want to convert.
- Select the original time unit.
- Select the target time unit.
- Click Convert or allow the calculator to update automatically.
- Use the Copy Result button to copy the converted value.
Time Conversion Accuracy
Fixed-duration units such as seconds, minutes, hours, days and weeks can be converted using exact mathematical relationships.
Calendar-based periods such as months and years require additional care because calendar months have different numbers of days and years can contain either 365 or 366 days.
Frequently Asked Questions About Time Conversion
How many seconds are in a minute?
There are 60 seconds in one minute.
How many minutes are in an hour?
There are 60 minutes in one hour.
How many seconds are in an hour?
There are 3,600 seconds in one hour.
How many hours are in a day?
A standard day contains 24 hours.
How many seconds are in a day?
A standard 24-hour day contains 86,400 seconds.
How many days are in a week?
One week contains 7 days.
How many hours are in a week?
One standard week contains 168 hours.
How many milliseconds are in a second?
One second contains 1,000 milliseconds.
How many microseconds are in a second?
One second contains 1,000,000 microseconds.
How many nanoseconds are in a second?
One second contains 1,000,000,000 nanoseconds.
How many days are in a year?
A common year has 365 days. A leap year has 366 days.
How many years are in a decade?
One decade contains 10 years.
How many years are in a century?
One century contains 100 years.
How many years are in a millennium?
One millennium contains 1,000 years.
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